Error 500 while reading DocID=Unknown

On saving the app definition after selecting Wide format for 2 views in a dashboard, I get this error:

What is it, and how can I deal with it?

I don’t think that would be related to your view width at all, you should contact appsheet support at

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Definitly not related to the view width as i just had the same error when deleting an action

Changed back to view width Tall and problem gone.